there becomes a linear positive relationship between education and voting Democratic.
That's about as suprising as finding out that there is a direct link between the % of blue collar workers in a given area how likely that area is to vote for the Labour Party 
In general, the less education in a particular area, the more likely that area is to vote Labour (although the link is not as strong as with occupations).
Things tend to get complicated in areas with very high levels of education though; when you get over a certain point (if memory serves, and it might not, that point is about 30% with a degree) it doesn't seem to have much of an effect, overall, at all (although it certainly has an effect on the sort of politicians elected in those areas).
